If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

How can a man go eight days without sleep?

Can you solve the photo plexer logic ?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

What month of the year has 28 days?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

The more of this there is, the less you see. What is it?